Dnp probe head for high resolution, liquid-state nmr

Abstract

An NMR probe head (1) for performing high-resolution, liquid-state DNP-NMR comprises a corrugated waveguide (3) for mw transmission, arranged along a longitudinal axis Z of the probe head; a system of at least two of mw reflecting mirrors (4-7) for mw beam transmission, focusing and reshaping the beam to match for a sample geometry; at least one RF coil (11,12) for NMR detection mounted in a way to allow mw passage to the sample area, characterized by a cooling system comprising a flow dewar tube (8) for feeding cryogenic fluid mounted at the side of the probe head and parallel to the corrugated waveguide and a thermally isolated sample chamber (26) surrounded by a chamber dewar (9); a sample spinning arrangement being configured to achieve uniform irradiation over a sample volume, to increase the sample volume under mw irradiation, and to reduce sample heating; a sample assembly (13) comprising concentric circular tubes or rods (15, 16) forming constraints for a sample layer (14). This arrangement is capable of exciting in particular even large sample volumes up to ~40 μL.

Dependencies are inferred from the claim text.